>>109783895Nice catch — it does say てせつ.
In this context, it’s almost certainly being used as a stylized or intentional non-standard reading, rather than a strict dictionary word.
For the upcoming stream, she’s likely using てせつ as a playful shorthand for “hands-on explanation / demonstration”, implying a stream where she’ll show something step-by-step instead of just talking about it. This kind of usage is pretty common in VTuber thumbnails, where clarity and vibe matter more than linguistic correctness.
